A possible answer is

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Pi is an irrational number and when you multiply a rational number with an irrational number, you end up with an irrational number.
Do number 11 in your own way.
Answer:
g = h(e-10)
Step-by-step explanation:
You can multiply the whole equation by h to get g by itself.
Answer:
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substitution and elimination means that you need to use one equation and substitute it in place of some variable in the other equation.
Consider the above two equations.
Take equation 1, which is 4x-2y=22 => x=(22+2y)/4
substitute the x value gained above in equation 2.
so, 2((22+2y)/4)+4y=6
22+2y+8y=12 => 10y = -10 => y= -1.
Substitute y= -1 in x value obtained in the beginning.
So, x= (22 - 2)/4 => 5.
There fore, x= 5 and y= -1
Hope it helps.